I have a similar piece which is a museum replica from Israel - I know because recently found the original depicted in a glass catalogue from the Israel Museum in Jerusalem. With a bit of luck you can find a tiny little butterfly (XB) mark on or near the bottom which could be (RR) back to back for Reuven Rubin - the Romanian/Israeli painter who made glass in the years before 1948. Bears little or no relation to the stuff the refinery which bears his name churns out nowadays, though.